Buggy code:
public static Result parse ( String source , RelativeSourceLocationPath sourceFile , IProgressMonitor monitor ) throws IOException , InterruptedException , ParseException , InvalidParseTableException , BadTokenException , SGLRException , TokenExpectedException { } private static Result run ( RelativeSourceLocationPath sourceFile , IProgressMonitor monitor , boolean generateFiles ) throws IOException , InterruptedException , ParseException , InvalidParseTableException , BadTokenException , SGLRException , TokenExpectedException { } private static Result run ( String source , RelativeSourceLocationPath sourceFile , IProgressMonitor monitor , boolean generateFiles ) throws IOException , InterruptedException , ParseException , InvalidParseTableException , BadTokenException , SGLRException , TokenExpectedException { } private void process ( String source , RelativePath sourceFile , IProgressMonitor monitor , boolean generateFiles ) throws IOException , InterruptedException , ParseException , InvalidParseTableException , BadTokenException , SGLRException , TokenExpectedException { } private void compileGeneratedJavaFiles ( ) throws IOException { } private IncrementalParseResult parseNextToplevelDeclaration ( String input , boolean recovery ) throws IOException , ParseException , InvalidParseTableException , BadTokenException , SGLRException , TokenExpectedException { } private void processEditorServicesDec ( IStrategoTerm toplevelDecl ) throws IOException { } private void processPlainDec ( IStrategoTerm toplevelDecl ) throws IOException { } private void processToplevelDeclaration ( IStrategoTerm toplevelDecl ) throws IOException , ParseException , InvalidParseTableException , BadTokenException , SGLRException , TokenExpectedException { } private IStrategoTerm currentParse ( String remainingInput , boolean recovery ) throws IOException , InvalidParseTableException , BadTokenException , SGLRException , TokenExpectedException { } private IStrategoTerm currentDesugar ( IStrategoTerm term ) throws IOException , InvalidParseTableException , BadTokenException , SGLRException , TokenExpectedException { } private void processPackageDec ( IStrategoTerm toplevelDecl ) throws IOException { } private void checkPackageName ( IStrategoTerm toplevelDecl ) { } private void processImportDecs ( IStrategoTerm toplevelDecl ) throws IOException , ParseException , InvalidParseTableException , BadTokenException , SGLRException , TokenExpectedException { } private void processImportDec ( IStrategoTerm toplevelDecl ) { sugaredImportDecls . add ( lastSugaredToplevelDecl ) ; Log . log . beginTask ( "processing" , "PROCESS<seq2seq4repair_space>the<seq2seq4repair_space>desugared<seq2seq4repair_space>import<seq2seq4repair_space>declaration." ) ; try { String importModule = ModuleSystemCommands . extractImportedModuleName ( toplevelDecl , interp ) ; String modulePath = FileCommands . getRelativeModulePath ( importModule ) ; boolean skipProcessImport = false ; if ( ! ( modulePath . startsWith ( "org//sugarj" ) ) ) { Path dep = ModuleSystemCommands . searchFile ( modulePath , ".dep" , environment ) ; Result res = null ; RelativeSourceLocationPath importSourceFile = null ; if ( dep != null ) { try { res = Result . readDependencyFile ( dep , environment ) ; } catch ( IOException e ) { Log . log . logErr ( ( "could<seq2seq4repair_space>not<seq2seq4repair_space>read<seq2seq4repair_space>dependency<seq2seq4repair_space>file<seq2seq4repair_space>" + dep ) ) ; } if ( ( ( res != null ) && ( ( res . getSourceFile ( ) ) != null ) ) && ( res . getSourceFile ( ) . getBasePath ( ) . equals ( environment . getRoot ( ) ) ) ) importSourceFile = res . getSourceFile ( ) ; } if ( importSourceFile == null ) importSourceFile = ModuleSystemCommands . locateSourceFile ( modulePath , environment . getSourcePath ( ) ) ; if ( ( importSourceFile != null ) && ( ( ( res == null ) || ( Driver . pendingInputFiles . contains ( res . getSourceFile ( ) ) ) ) || ( ! ( res . isUpToDate ( res . getSourceFile ( ) , environment ) ) ) ) ) { if ( ! ( generateFiles ) ) { setErrorMessage ( toplevelDecl , ( "module<seq2seq4repair_space>outdated,<seq2seq4repair_space>compile<seq2seq4repair_space>first:<seq2seq4repair_space>" + importModule ) ) ; } else { Log . log . log ( "Need<seq2seq4repair_space>to<seq2seq4repair_space>compile<seq2seq4repair_space>the<seq2seq4repair_space>imported<seq2seq4repair_space>module<seq2seq4repair_space>first<seq2seq4repair_space>;<seq2seq4repair_space>processing<seq2seq4repair_space>it<seq2seq4repair_space>now." ) ; try { storeCaches ( environment ) ; if ( Driver . currentlyProcessing . contains ( importSourceFile ) ) { driverResult . appendToFile ( javaOutFile , ( ( "import<seq2seq4repair_space>" + importModule ) + ";\n" ) ) ; skipProcessImport = true ; delegateCompilation = importSourceFile ; } else { Result importResult = Driver . compile ( importSourceFile , monitor ) ; initializeCaches ( environment , true ) ; if ( importResult . hasFailed ( ) ) setErrorMessage ( toplevelDecl , ( "problems<seq2seq4repair_space>while<seq2seq4repair_space>compiling<seq2seq4repair_space>" + importModule ) ) ; } } catch ( Exception e ) { setErrorMessage ( toplevelDecl , ( "problems<seq2seq4repair_space>while<seq2seq4repair_space>compiling<seq2seq4repair_space>" + importModule ) ) ; } Log . log . log ( ( ( "CONTINUE<seq2seq4repair_space>PROCESSING'" + importSourceFile ) + "'." ) ) ; } } if ( dep == null ) dep = ModuleSystemCommands . searchFile ( modulePath , ".dep" , environment ) ; <START_BUG> if ( dep != null ) <END_BUG> driverResult . addDependency ( dep , environment ) ; if ( driverResult . hasDelegatedCompilation ( importSourceFile ) ) { driverResult . appendToFile ( javaOutFile , ( ( "import<seq2seq4repair_space>" + importModule ) + ";\n" ) ) ; skipProcessImport = true ; } } boolean success = skipProcessImport || ( processImport ( modulePath , toplevelDecl ) ) ; if ( ! success ) setErrorMessage ( toplevelDecl , ( "module<seq2seq4repair_space>not<seq2seq4repair_space>found:<seq2seq4repair_space>" + importModule ) ) ; } catch ( Exception e ) { throw new RuntimeException ( e ) ; } finally { Log . log . endTask ( ) ; } } private boolean processImport ( String modulePath , IStrategoTerm importTerm ) throws IOException { } private void processJavaTypeDec ( IStrategoTerm toplevelDecl ) throws IOException { } private void processSugarDec ( IStrategoTerm toplevelDecl ) throws IOException , InvalidParseTableException , BadTokenException , SGLRException , TokenExpectedException { } private void buildCompoundSdfModule ( ) throws IOException { } private void buildCompoundStrModule ( ) throws IOException { } private void checkCurrentGrammar ( ) throws IOException , InvalidParseTableException , BadTokenException , SGLRException , TokenExpectedException { } private void checkCurrentTransformation ( ) throws IOException , InvalidParseTableException , BadTokenException , SGLRException , TokenExpectedException { } private void initEditorServices ( ) throws IOException , BadTokenException , SGLRException , TokenExpectedException { } private void init ( RelativePath sourceFile , boolean generateFiles ) throws FileNotFoundException , IOException , InvalidParseTableException { } public static void main ( String [ ] args ) { } @ SuppressWarnings ( "unchecked" ) private void initializeCaches ( Environment environment , boolean force ) throws IOException { }

Fix:
if ( ( dep != null ) && ( ! skipProcessImport ) )